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In computer, for example, if we use integer to represent position of objects, position can be (0,0) , (3,5), but not in (1.5,3.5).

In real world, there are something that is discrete, such as atomic energy level. Is there similar concept about the matter(eg: quark) that can exists in some position only?

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marked as duplicate by ACuriousMind, anna v, David Z Nov 11 '15 at 5:41

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